Pump group Termojet with thermostatic valve 25 - 55* 1" FT in thermal insulation without pump PG-46L

Pump group NG-46 L with thermostatic valve — a pre-assembled Termojet unit in left-hand configuration for circuits where the coolant temperature must be limited without boiler room automation. The three-way thermostatic valve maintains the supply temperature in the range of 25–55 °C, the thermal insulation jacket minimises heat losses, and the «L» designation indicates a mirrored (left-hand) line arrangement — convenient when the boiler room pipework is planned from the left.

The group operates on the principle of return water blending: as soon as the supply temperature rises above the set point, the thermostatic mixing valve adds cooled coolant from the return line — the circuit consistently receives the set temperature regardless of the boiler mode. Valves with thermometers 0–120 °C on the supply and return lines display the actual operating conditions and allow the circuit to be isolated for servicing, the built-in check valve prevents parasitic circulation, and union nut connections speed up installation and removal.

Application scenarios: underfloor heating, low-temperature radiator branches, temperature-limited circuits in systems with gas and solid-fuel boilers. Precise supply temperature control also makes the group suitable for heat pump systems — see equipment for low-temperature heating on the Termojet heat pumps page. The group is mounted on a distribution manifold K22V.125 (2+1, outlets up); connection to a manifold with 1¼″ outlets is made via adapter KP125/150.

Advantages of the NG-46 L from Termojet:

• left-hand configuration — greater flexibility when arranging units on the manifold;
• complete factory equipment: shut-off valves with thermometers, check valve, thermostatic valve 25–55 °C;
• thermal insulation jacket with group mounting bracket included;
• Ukrainian manufacture: price without import markups, availability, warranty.

Technical specifications: circuit capacity 15 kW at ΔT=10 °C and 30 kW at ΔT=20 °C, Kvs 3,5 m³/h, connection to the manifold and heating circuit — 1″, working pressure up to 3 bar, height 353 mm, width 261 mm, volume 0,34 l. Circulation pump (installation length 130 mm) is not included — we recommend the Termojet APE 25-60 circulation pump (130 mm). Other configurations and thermostatic valve ranges are available in the Termojet pump group catalogue.

Frequently Asked Questions

What does «L» mean in the group name?
Left-hand configuration: the supply and return lines are positioned as a mirror image of the standard version — choose according to the actual pipework layout of your boiler room.

Which pump should be installed?
A circulation pump with an installation length of 130 mm; the optimal choice is the energy-saving Termojet APE 25-60 (130 mm).